Renesas 70V25S25PF8

Overview

IDT70V25S25PF8 from Integrated Device Technology is a high-speed 3.3V 4K x 16 true dual-port static RAM with independent left/right ports, 25 ns maximum access time (commercial grade), 400 mW typical active power, and 3.3 mW typical standby power. It supports simultaneous asynchronous reads/writes to the same memory location and is used in real-time inter-processor communication, FPGA co-processing, and embedded control systems requiring deterministic low-latency data exchange.

For engineers reviewing the IDT70V25S25PF8 datasheet, IDT70V25S25PF8 pinout, IDT70V25S25PF8 application, or IDT70V25S25PF8 equivalent, this page delivers verified electrical specs, validated TQFP-100 pin mapping, industrial-grade timing behavior, and direct alternatives for bus-width expansion, semaphore-controlled multi-core synchronization, and legacy 3.3V dual-port memory replacement.

Technical Context

The IDT70V25S25PF8 implements fully asynchronous dual-port architecture with on-chip arbitration logic, enabling conflict-free concurrent access from two independent buses. It features separate upper-byte (I/O8–I/O15) and lower-byte (I/O0–I/O7) controls, Master/Slave cascading via M/S pin, and hardware semaphore support across eight flags addressed by A0–A2.

It operates on a single 3.3 V ±0.3 V supply, supports LVTTL-compatible signaling, and includes BUSY flag handshake, interrupt flag (INTL/INTR), and automatic power-down via chip enable (CEL/CER). The device targets industrial temperature range (–40°C to +85°C) and is fabricated in CMOS high-performance technology.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant green variant available.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C024AV-25AXC and R1EX24002AS0C-25, the IDT70V25S25PF8 uniquely delivers hardware-enforced semaphore arbitration and bidirectional BUSY flag signaling-enabling zero-software-overhead synchronization in safety-critical or ultra-low-latency dual-CPU systems.

Availability

IDT70V25S25PF8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-CPU co-processing interfaces, and motor drive controller synchronization requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for IDT70V25S25PF8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions for communications, computing, and industrial markets.

The IDT70V25 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems-emphasizing hardware arbitration, byte-select flexibility, and industrial temperature reliability.

FAQ

What is the maximum operating frequency supported by the IDT70V25S25PF8?

The IDT70V25S25PF8 does not operate on a clock; it is an asynchronous SRAM. Its maximum effective throughput is determined by its 25 ns access time (tAA), supporting up to 40 MHz random read/write cycles in worst-case commercial conditions. Timing parameters such as tRC (read cycle time) and tWC (write cycle time) are all specified at 25 ns max, enabling reliable operation in systems with tight timing budgets.

Does the IDT70V25S25PF8 support industrial temperature range?

Yes, the IDT70V25S25PF8 is rated for –40°C to +85°C operation. This is explicitly confirmed in the datasheet's "Industrial temperature range (-40°C to +85°C) is available for selected speeds" note and validated in DC/AC electrical characteristics tables for "Ind" grade testing conditions. The "S" suffix denotes standard power (vs. "L" for low-power), and "25" specifies the 25 ns speed grade qualified across industrial temp.

How is semaphore functionality implemented in the IDT70V25S25PF8?

The IDT70V25S25PF8 implements eight hardware semaphore flags accessed via A0–A2 address lines. When SEM = VIL and CE = VIH (or UB & LB = VIH), the device enters semaphore mode: writing to I/O0 sets the flag, and reading returns the flag state across all I/O pins (I/O0–I/O15). Contention window (tSPS = 5 ns) and write-to-read delay (tSWRD = 5 ns) are guaranteed, enabling atomic test-and-set operations without software intervention.

Can the IDT70V25S25PF8 be used in a Master/Slave configuration with other IDT70V25 devices?

Yes. The IDT70V25S25PF8 supports cascaded Master/Slave operation via the M/S pin: set M/S = VIH for Master (BUSY output), M/S = VIL for Slave (BUSY input). When multiple IDT70V25S25PF8 devices are connected, the Master's BUSY output feeds the Slave's BUSY input, enabling coordinated 32-bit+ data bus expansion with automatic port arbitration-no external glue logic required.

What is the function of the BUSY flag in the IDT70V25S25PF8?

The BUSY flag in the IDT70V25S25PF8 signals real-time port contention: when both ports attempt simultaneous access to the same memory address, the BUSY line asserts (active-high push-pull) to notify the contending master that the operation is blocked. In Master/Slave topology, BUSY propagates through the chain to halt upstream writes-providing hardware-enforced flow control essential for deterministic system-level timing.